SOLUTION: COMBINED VARIATION The amount of time it takes to build a road varies directly with the length of the road and inversely with the numbers of workers. Suppose also that it takes

Question 1201363: COMBINED VARIATION
The amount of time it takes to build a road varies directly with the length of the road and inversely with the numbers of workers. Suppose also that it takes 200 workers in 18 weeks to build 12 miles of road. How long will it take 175 workers to build 14 miles of road.
Let W be the number of weeks
Let P be the number of workers
Let M be the number of miles
INVERSE VARIATION
My sister's phone varies inversely as its age. She bought a 4 year old phone for Php. 28,000. What will be the value of my sister's car when it is 8 years old.
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
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COMBINED VARIATION
The amount of time it takes to build a road varies directly with the length of the road and inversely with the numbers of workers. Suppose also that it takes 200 workers in 18 weeks to build 12 miles of road. How long will it take 175 workers to build 14 miles of road.
Let W be the number of weeks
Let P be the number of workers
Let M be the number of miles
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, using variation constant, k.
To find k, you are given this set of variables assignments:
P=200
W=18
M=12

You can do the rest.

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My sister's phone varies inversely as its age. She bought a 4 year old phone for Php. 28,000. What will be the value of my sister's car when it is 8 years old.
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That makes no sense.
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